/Engine/Source/Editor/SequencerCore/Public/MVVM/Views/SOutlinerView.h
The tree view used in the sequencer
class SOutlinerView : public [STreeView< TWeakViewModelPtr< IOutlinerExtension > >](API\Editor\UnrealEd\STreeView)
TArray<FCached...
PhysicalNodes
Linear, sorted array of nodes that we currently have generated widgets for